Anti-aircraft guns are seen in the wreckage of the sunken USS Lexington, a World War II US Navy aircraft carrier, in this handout image obtained March 6, 2018 courtesy of Paul G. Allen. Photo - Paul G. Allen handout via Reuters TV

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Anti-aircraft guns are seen in the wreckage of the sunken USS Lexington, a World War II US Navy aircraft carrier, in this handout image obtained March 6, 2018 courtesy of Paul G. Allen. Photo - Paul G. Allen handout via Reuters TV

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A fighter aircraft is seen in the wreckage of the sunken USS Lexington, a World War II US Navy aircraft carrier, in this handout image obtained March 6, 2018 courtesy of Paul G. Allen. Photo - Paul G. Allen handout via Reuters TV

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A torpedo is seen in the wreckage of the sunken USS Lexington, a World War II US Navy aircraft carrier, in this handout image obtained March 6, 2018 courtesy of Paul G. Allen. Photo - Paul G. Allen handout via Reuters TV

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Fighter aircraft are seen in the wreckage of the sunken USS Lexington, a World War II US Navy aircraft carrier, in this handout image obtained March 6, 2018 courtesy of Paul G. Allen. Photo - Paul G. Allen handout via Reuters TV

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A fighter aircraft is seen in the wreckage of the sunken USS Lexington, a World War II US Navy aircraft carrier, in this handout image obtained March 6, 2018 courtesy of Paul G. Allen. Photo - Paul G. Allen handout via Reuters TV

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A fighter aircraft is seen in the wreckage of the sunken USS Lexington, a World War II US Navy aircraft carrier, in this handout image obtained March 6, 2018 courtesy of Paul G. Allen. Photo - Paul G. Allen handout via Reuters TV

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Wreckage of the sunken USS Lexington, a World War II US Navy aircraft carrier, is seen in this still frame taken from March 4, 2018 underwater video footage courtesy of Paul G. Allen. Photo - Paul G. Allen handout via Reuters TV

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One of the guns on the sunken wreckage of the USS Lexington, a World War II US Navy aircraft carrier, is seen in this still frame taken from March 4, 2018 underwater video footage courtesy of Paul G. Allen. Photo - Paul G. Allen handout via Reuters TV

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Wreckage of the sunken USS Lexington, a World War II US Navy aircraft carrier, is seen in this still frame taken from March 4, 2018 underwater video footage courtesy of Paul G. Allen. Photo - Paul G. Allen handout via Reuters TV